Palaeorhiza (Cercorhiza) Hirashima 1982

Hirashima 1982. A synopsis of the bee genus Palaeorhiza Perkins (Hymenoptera, Colletidae) of New Guinea Part 7. Subgenus Cercorhiza. Journal of the Faculty of Agriculture Kyushu University, 26(2-3) 1982: 87-109